Activity-dependent regulation of dendritic complexity by semaphorin 3A through Farp1

Cheadle, L., Biederer, T. (June 2014) Activity-dependent regulation of dendritic complexity by semaphorin 3A through Farp1. J Neurosci, 34 (23). pp. 7999-8009. ISSN 0270-6474 (Print)0270-6474

DOI: 10.1523/jneurosci.3950-13.2014


Dendritic arbors are complex neuronal structures that receive and process synaptic inputs. One mechanism regulating dendrite differentiation is Semaphorin/Plexin signaling, specifically through binding of soluble Sema3A to Neuropilin/PlexinA coreceptors. Here we show that the protein Farp1 [FERM, RhoGEF (ARHGEF), and pleckstrin domain protein 1], a Rac1 activator previously identified as a synaptogenic signaling protein, contributes to establishing dendrite tip number and total dendritic branch length in maturing rat neurons and is sufficient to promote dendrite complexity. Aiming to define its upstream partners, our results support that Farp1 interacts with the Neuropilin-1/PlexinA1 complex and colocalizes with PlexinA1 along dendritic shafts. Functionally, Farp1 is required by Sema3A to promote dendritic arborization of hippocampal neurons, and Sema3A regulates dendritic F-actin distribution via Farp1. Unexpectedly, Sema3A also requires neuronal activity to promote dendritic complexity, presumably because silencing neurons leads to a proteasome-dependent reduction of PlexinA1 in dendrites. These results provide new insights into how activity and soluble cues cooperate to refine dendritic morphology through intracellular signaling pathways.

Item Type: Paper
CSHL Authors:
Communities: CSHL labs > Cheadle lab
Depositing User: Matthew Dunn
Date: 4 June 2014
Date Deposited: 07 Aug 2020 19:29
Last Modified: 07 Aug 2020 19:29
PMCID: PMC4044256

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